ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (12): 2243-2250.doi: 10.11843/j.issn.0366-6964.2015.12.016

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Construction and Preliminary Application of Balanced Lethal System Based on Attenuated Salmonella SG97A

GENG Shi-zhong#,CHEN Xiao-juan#,PAN Zhi-ming,JIAO Xin-an*   

  1. (Jiangsu Key Laboratory of Zoonoses,Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses,Yangzhou University,Yangzhou 225009,China)
  • Received:2015-04-13 Online:2015-12-23 Published:2015-12-23

Abstract:

The aim of this study was to delete asd gene of Salmonella gallinarum (SG) attenuated vaccine strain 97A and construct bivalent live vaccine based on host-vector balanced lethal system to express F protein of Newcastle disease virus(NDV).Two DNA fragments flanking asd gene as allele were amplificated by PCR and asd gene was replaced by chloramphenicol resistance(CmR) gene to construct the suicide plasmid pGMB151Δasd::CmR.After conjugation,the recombiant plasmid was transformed into SG97A from E.coli χ7213,SG97AΔasd::CmR was reversely screened out under the selectable pressure of chloramphenicol,DAP-dependent strain was named SG97AΔasd.Vector-host balanced lethal system was construct by pYA3334 containing asd gene being transferred into SG97AΔasd and to expressed F protein of NDV.SG97AΔasd was successfully constructed by allelic exchanges,its growth was DAP-dependent.Vector-host balanced lethal system was constructed by pYA3334 being transferred to SG97AΔasd and could express F protein of NDV and also induce specific antibodies in infected chickens.Vector-host balanced lethal system was constructed successfully based on attenuated Salmonella SG97AΔasd in this study and could express F gene of NDV as foreign gene to induce special antibodies in animal model,it laid a foundation for bivalent live vaccine based on attenuated Salmonella.

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